[1] The consequent closing of the churches except for preaching
services leads Muller (_Luther und Karlstadt_, p. 52) to see in this
the origin of the Protestant custom of closing churches on weekdays.
[2] August 1, 1521. Enders, _Luthers Briewechsel_, III, 208.
[3] December 20, 1521. Enders, III, 257.
[4] Date of both, November, 1521. Both in _Weimar Ed._, VIII, and in
_Erl. Ed., O; var. arg._, VI. The latter also in German (_Vom
Misbrauch der Messe_), _Erl. Ed._, XXVIII.
[5] 24 Theses (July, 1521). Barge, _Andreas Bodenstein von Karlstadt_,
I, 291. Repeated in _De celebratione missae_ (October), _ibid._, 487.
[6] _De scandalo et missa_ (Oct. or Nov.), _ibid._, 491.
[7] _De cantu gregoriano disputatio_ (1520), _ibid._, 492.
[8] _Von Abthuung der Bilder_ (January, 1522), _ibid._, 367.
[9] See Kostlin-Kawesau, _Martin Luther_, I, 485.
[10] Published by H. Lietzmann in _Kleine Texte_, no. 21; also in
Richter, _Kirchenordnungen_, II, 484.
[11] _Weimar Ed._, VIII, 670 ff. _Erl. Ed._, XXII, 43 ff.
[12] Luther's letter to the elector on March 7th. De Wette, II, 138;
_Weimar Ed._, Xc Introd., xlvii f.
[13] Enders, III, 484.
[14] Kessler, _Sabbata_, _St. Gallen_, 1902. Quoted at length in
_Weimar Ed._, Xc, Introduction, lii.
[15] Letter of Albert Burer, _Briewechsel des Beatus Rhenanus_, 303.
See also Introd., liii, in _Weimar Ed._, Xc.
[16] _Weimar Ed._, Xb; _Erl. Ed._, XXVIII.
[17] See Kawerau, _Luthers Ruckkehr von der Wartburg_, 67. Fragment in
full in _Weimar Ed._, Xc, Introduction, lv ff., where see also a
recently discovered short Latin fragment, which served a similar
purpose.